PV Surplus Charging for EVs Using Shelly 3EM and clever-PV
Overview
This project demonstrates how clever-PV and Shelly Pro 3EM enable fully automated EV charging based on solar surplus.
The setup is designed for end-user simplicity: connect Shelly Pro 3EM to clever-PV in just a few clicks, and clever-PV manages the charging automatically.
Users don’t need to configure complicated rules. Clever-PV calculates the optimal charging times based on PV production, household demand, and pricing signals.
Scope/Deployment:
Residential households with PV installations and EV wallboxes
Supported wallboxes: KEBA, go-e, Easee, and many more
Tested and verified by P3 Systems Engineering
Goal:
Charge EVs primarily with solar energy
Avoid expensive grid electricity
Enable seamless automation without manual intervention
Challenges
Without automation, EV chargers often pull from the grid unnecessarily
Wallboxes rarely have full visibility into household energy flows
Manual scheduling is inconvenient and inefficient
Meter Transition in a high resolution <5 s for optimal control algorithm
Solutions / Implementation
Solution:
The Shelly Pro 3EM measures real-time power flows directly at the grid connection point and sends the data to clever-PV.
With this data, clever-PV calculates the available PV surplus and activates or modulates the EV charger automatically.
Because the integration is seamless, users only need to pair the Shelly Pro 3EM once — clever-PV handles the entire optimization process in the background.
Key Features:
One-click Shelly integration in clever-PV
Real-time monitoring of grid import/export
Automated PV surplus charging without manual setup
Intelligent scheduling based on production forecasts
Implementation:
Install Shelly Pro 3EM at the household grid connection
Pair Shelly Pro 3EM with clever-PV in just a few clicks
Integrate EV wallbox via clever-PV (API and OCPP are supported)
clever-PV automatically manages charging based on PV surplus including automatic phase-switching
Products Used:
Shelly Pro 3EM
clever-PV HEMS
Web: https://clever-pv.com/
Android: https://play.google.com/store/apps/details?id=com.cleverpv.cleverpv&hl=de
Apple: https://apps.apple.com/de/app/clever-pv/id6448946545
Compatible EV wallbox
PV inverter
Results
Up to 99% EV charging covered by solar energy
Maximum utilization of free PV energy
Zero manual configuration — fully automated optimization
Validated performance by P3 Systems Engineering
Download Full Report: https://www.p3-group.com/p3-updates/p3-energy-management-benchmark/
Conclusion
This integration between Shelly Pro 3EM and clever-PV offers effortless EV charging optimization.
Users enjoy maximum cost savings, energy independence, and sustainability — all without technical setup or manual scheduling.
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